Definition from Wiktionary, the free dictionary
bloodletting (plural bloodlettings)
- The archaic practice of treating illness by removing some blood, believed to be tainted, from the stricken person.
- By extension, the diminishment of any resource with the hope that this will lead to a positive effect.
- A circumstance such as a battle where a large amount of blood is likely to be spilled through violence.
ancient medical practice